DOC: Drop covenant boilerplate

Author: effigies

.github/CODE_OF_CONDUCT.md

@@ -89,18 +89,17 @@ issues.
 
 ## Incident Reporting
 
-Instances of abusive, harassing, or otherwise unacceptable behavior may be reported by contacting
-project maintainer Chris Markiewicz <markiewicz@stanford.edu>. All complaints will be reviewed and
-investigated and will result in a response that is deemed necessary and appropriate to the
-circumstances. The project team is obligated to maintain confidentiality with regard to the
-reporter of an incident.
+We put great value on respectful, friendly and helpful communication.
 
-Project maintainers who do not follow or enforce the Code of Conduct in good faith may face
-temporary or permanent repercussions as determined by other members of the project's leadership.
+If you feel that any of our Nibabel communications lack respect, or are unfriendly or unhelpful,
+please try the following steps:
+
+* If you feel able, please let the person who has sent the email or comment that you found it
+  disrespectful / unhelpful / unfriendly, and why;
+
+* If you don't feel able to do that, or that didn't work, please contact Chris Markiewicz directly
+  by email (<markiewicz@stanford.edu>), and he will do his best to resolve it.
 
 ## Attribution
 
 The vast majority of the above was taken from the NIPY Code of Conduct.
-Incident reporting guidelines were adapted from the [Contributor
-Covenant](https://www.contributor-covenant.org/), version 1.4, available at
-https://www.contributor-covenant.org/version/1/4/code-of-conduct.